I've been wanting to get the extra blocks for some time and I already own Asset Forge. I hope you see this and can help. I really love this program. I'm still learning Asset Forge 2 but I see good things in its future.
Asset Forge is currently not on sale and a sale isn't planned in the near future. If you own the standard edition of Asset Forge you can upgrade for about $20 (the price difference between the two versions) to Deluxe at any point.